Extremely limited openings for it and others (9)

I believe the answer is:

vermouths

I'm a little stuck... Click here to teach me more about this clue!

'for it and others' is the definition.
I can't tell whether this defines the answer.

'extremely limited openings' is the wordplay.
'extremely' becomes 'very' (I've seen this before).
'limited' means to remove the last letter.
'openings' becomes 'mouths' (mouth is a kind of opening).
'very' with its final letter taken away is 'ver'.
'ver'+'mouths'='VERMOUTHS'

Can you help me to learn more?

I've seen this clue in The Guardian.

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